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1.
Sports video appeals to large audiences due to its high commercial potentials. Automatically extracting useful semantic information and generating highlight summary from sports video to facilitate users‘ accessing requirements is an important problem, especially in the forthcoming broadband mobile communication and the need for users to access their multimedia information of interest from anywhere at anytime with their most convenient digital equipments. In this paper, a system to generate highlight summaries oriented for mobile applications is introduced, which includes highlight extraction and video adaptation. In this system, several highlight extraction techniques are provided for field sports video and racket sports video by using multi-modal information. To enhance users‘ viewing experience and save bandwidth, 3D animation from highlight segment is also generated. As an important procedure to make video analysis results universally applicable, video transcoding techniques are applied to adapt the video for mobile communication environment and user preference. Experimental results are encouraging and show the advantage and feasibility of the system for multimedia content personalization, enhancement and adaptation to meet different user preference and network/device requirements. 相似文献
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INTRODUCTION Multimedia services over the Internet are be- coming popular due to the widespread deployment of broadband access. However, the conventional cli- ent-server architecture severely limits the number of simultaneous users, especially for bandwidth inten- sive applications such as video streaming. P2P net- works, on the other hand, offer a solution to the scalability problem. As a node joins a P2P network, it not only consumes resources but also contributes its bandwidth or comp… 相似文献
3.
JI Xin POLLIN Sofie LENOIR Gregory LAFRUIT Gauthier DEJONGHE Antoine CATTHOOR Francky 《浙江大学学报(A卷英文版)》2006,7(Z1)
This paper introduces a video application-aware cross-layer framework for joint performance-energy optimization, considering the scenario of multiple users upstreaming real-time Motion JPEG2000 video streams to the access point of a WiFi wireless local area network and extends the PHY-MAC run-time cross-layer scheduling strategy that we introduced in (Mang-haram et al., 2005; Pollin el al., 2005) to also consider congested network situations where video packets have to be dropped. We show that an optimal solution at PHY-MAC level can be highly suboptimal at application level, and then show that making the cross-layer framework application-aware through a prioritized dropping policy capitalizing on the inherent scalability of Motion JPEG2000 video streams leads to drastic average video quality improvements and inter-user quality variation reductions of as much as 10 dB PSNR, without affecting the overall energy consumption requirements. 相似文献
4.
DING Ming LUO Han-wen WU Yun 《浙江大学学报(A卷英文版)》2007,8(1):10-17
INTRODUCTION Owing to its inherent ability to combat the multi-path fading channel, the modulation technology of orthogonal frequency division multiplexing (OFDM) has been widely used in many high-rate data transmissions such as digital video broadcasting (DVB-T), wireless local area network (IEEE 802.11a) and broadband wireless access (IEEE 802.16e). Re-cently, it is accepted as the most promising candidate for E-UTRA downlink (3GPP TSG-RAN-1, 2006a), which is a super 3G cell… 相似文献
5.
INTRODUCTION With the widespread deployment of broadband access, Video-on-Demand (VoD) streaming on the Internet has received increasing attention recently. In VoD service, video streams are delivered to asyn- chronous users with low delay and VCR-like opera- tion support (e.g., pause, fast-forward, and rewind). However, streaming to a large population of clients is very challenging due to the limited server capacity and little deployment of IP multicast in today’s Internet (Quinn a… 相似文献
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1IntroductionRecent advances in wireless communication,digitallibrary,distributed multi media,massive storage,andmobile computing technologies are sti mulating the de-velopment of mobile multi media digital library systems(M2DLS)that allow mobile clients to access multi me-dia material anywhere and anyti me over a cellular ra-dio network[1,2].In M2DLS,multi media objects,ingeneral,can be composed of multiple media streamssuch as audio and video,whose retrieval must proceedso as to not only … 相似文献
7.
It is expected that by 2003 continuous media will account for more than 50% of the data available on origin servers, this will provoke a significant change in Internet workload. Due to the high bandwidth requirements and the long-lived nature of digital video, streaming server loads and network bandwidths are proven to be major limiting factors. Aiming at the characteristics of broadband network in residential areas, this paper proposes a popularity-based server-proxy caching strategy for streaming media. According to a streaming media popularity on streaming server and proxy, this strategy caches the content of the streaming media partially or completely. The paper also proposes two formulas that calculate the popularity coefficient of a streaming media on server and proxy, and caching replacement policy. As expected, this strategy decreases the server load, reduces the traffic from streaming server to proxy, and improves client start-up latency. 相似文献
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1 Introduction One class of applications , such as power networkscheduling, intelligent traffic and real-ti me monitor-ing,demand that distributed databases are able to pro-cess theti ming constraints of data and transactions andprovide ti mely and correct results ,i.e. distributedreal-ti me database systems are required .In general ,adistributed real-ti me database system(DRTDBS) is thedistributed database system within which transactionsand data have ti ming constraints and system correct-… 相似文献
9.
In H.264, computational complexity and memory access of deblocking filters are variable, dependent on video contents. This paper proposes a VLSI architecture of deblocking filters with adaptive dynamic power, which avoids redundant computations and memory accesses by precluding the blocks that can be skipped. The vertical and horizontal edges are simultaneously processed in an advanced scan order to speed up the decoder. As a result, dynamic power of the proposed architecture can be reduced adaptively （up to about 89%） for different videos, and the off-chip memory access is improved when compared to previous designs. Moreover, the processing capability of the proposed architecture is in particular appropriate for real-time deblocking of high-definition television （HDTV, 1920× 1080 pixels/frame, 60 frames/s video signals） video operation at 62 MHz. Using the proposed architecture, power can be reduced by up to about 89% and processing time by from 25% to 81% compared with previous designs. 相似文献
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A new approach to the design of the optical fiber direction coupler by using neural network is proposed. To train the artificial neural network, the coupling length is defined as the input sample, and the coupling ratio is defined as the output sample. Compared with the numerical value calculation of the theoretical formula, the error of the neural network model output is 1% less. Then, through the model, to design a broadband or a single wavelength optical fiber direction coupler becomes easy. The method is proved to be reliable, accurate and time-saving. So it is promising in the field of both investigation and application. 相似文献
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针对舰船边缘信息检测实时性差、检测效果不佳等问题,通过选取适用于舰船边缘检测的数学形态运算与最大类间方差二值法的方法,并结合 FPGA并行处理能力,构建舰船边缘检测硬件平台。在该硬件平台上,采用FPGA对舰船目标相关算法进行硬件实现。从舰船图像处理结果分析可知,采用传统CPU进行算法处理需要约120ms,采用FPGA实现仅需21.2ms,采用FPGA加速后处理速度提高5倍以上,完全可满足实时性要求,因此该方法具有良好的应用前景。 相似文献
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为改变采用CPU控制矩阵键盘导致CPU资源利用下降及引脚不足的现状,介绍了一种基于FPGA的矩阵键盘控制器的开发。在ISE13．4开发环境下,采用VHDL硬件语言开发了一种能有效防止机械式矩阵键盘按键抖动带来的数据错误;实现矩阵键盘的自动扫描、编码、存储、输出等功能;并将输入的数据依次在8个7段数码管上进行显示的矩阵键盘控制器。将所设计的VHDL控制器配置到开发的硬件电路系统上,验证了各项功能设计的正确性。 相似文献
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余红梅 《宁波职业技术学院学报》2007,11(2):58-60
为改变传统移频自动闭塞系统存在技术落后、信息量少、可靠性差,不能满足现代运输生产的发展需求状况,应用先进的单片机技术,可编程逻辑芯片(FPGA)和高性能CPU,通过逻辑结构设计和时序控制,实现了移频自动闭塞设备的集成化、通用化,大幅度提高了列车运行的可靠性,并为实现机车信号主体化创造了条件。 相似文献
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针对非均匀有理B 样条 (non uniform rational B spline, NURBS)曲线高速高精加工过程中计算负载高的问题,提出一种基于两级插补机制的NURBS曲线插补器方案,在主控端执行第一级插补,完成曲线预处理等粗插补工作;在运动控制端执行第二级插补,完成加减速及实时位置输出等精插补工作。同时,设计并开发基于ARM FPGA架构的实验平台,可用于两级插补器的实验验证,具有一定的现实参考意义。 相似文献
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针对双单片机冲床主从式系统的软件分工,分别设计主CPU系统和从CPU系统的软件结构。主CPU完成系统的管理和数据处理等非实时性任务,从CPU完成插补和位置控制等实时性任务。采用双口RAM通信协议,加速主从CPU系统间机床状态信息和加工数据的传送。 相似文献
16.
李华 《商洛师范专科学校学报》2014,(2):17-20
为了获取最佳成像效果。设计了一套基于FPGA、应用于CMOS成像系统的自动曝光算法。详细阐述了基于FPGA的图像分块自动曝光算法设计过程。实验结果表明,系统成像效果较好,即使在背光和正面光时也能取得较理想的图像。整个系统性能稳定可靠、实时性好。具有很强的通用性。 相似文献
17.
一个混沌系统设计及其FPGA电路实现 总被引：1，自引：1，他引：0
提出了一个混沌系统,并利用理论和数值仿真对系统的基本特性进行了分析.通过Lyapunov指数谱和分岔图,对系统的状态转换进行了分析.为验证系统的混沌行为,在matlab的simulink下,利用DSP Builder设计了一个电路,并转换成VHDL代码程序,用Quartus II下载到FPGA硬件电路中进行了实验,实验结果与仿真结果完全一致,提出了一种基于FPGA平台和EDA开发工具实现混沌吸引子的新方法. 相似文献
18.
设计一个基于机器视觉的光电色选机控制系统,在研究光电色选机工作原理和工作过程的基础上,设计一种主从式双CPU控制的色选机控制系统.采用ARM作为整个系统的主控制CPU,采用DSP作为光电检测信号的运算CPU,构成主从协同工作的双CPU结构,共同完成色选机控制系统的各种数据处理和控制功能,以提高系统的整体性能和对数据的快速处理能力. 相似文献
19.
焦冬莉 《雁北师范学院学报》2013,(3):31-33
限幅滤波法是抑制正交频分复用（OFDM）信号的PAPR的常用硬件实现方法。使用FPGA可缩短系统设计开发时间,提高系统可靠性。本文在用FPGA实现限幅滤波的基础上,讨论了基于FPGA设计时应考虑的主要问题,以及影响设计性能的几个因素,包括：乘法器的设计、算法的优化、芯片的选择等。 相似文献
20.
光电色选机是用于散体物料品质检测和分级的一种有效的分选设备,在研究光电色选机组成及工作原理的基础上,设计一种主从式双CPU控制的色选机控制系统,采用ARM作为整个系统的主控制CPU,采用DSP作为光电检测信号的运算CPU,构成主从协同工作的双CPU结构,共同完成色选机控制系统的各种数据处理和控制功能,以提高系统的整体性能和对数据的快速处理能力． 相似文献